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Move declaration and initialisation of saw_line and saw_func out of for loop.
[binutils.git] / bfd / elf32-s390.c
CommitLineData
a85d7ed0 1/* IBM S/390-specific support for 32-bit ELF
e92d460e 2 Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
a85d7ed0
NC		 3 Contributed by Carl B. Pedersen and Martin Schwidefsky.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "bfdlink.h"
25#include "libbfd.h"
26#include "elf-bfd.h"
27
28static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
0451c93c
MS		 32static boolean elf_s390_is_local_label_name
33 PARAMS ((bfd *, const char *));
34static struct bfd_hash_entry *link_hash_newfunc
a85d7ed0
NC		 35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 PARAMS ((bfd *));
0451c93c
MS		 38static boolean create_got_section
39 PARAMS((bfd *, struct bfd_link_info *));
40static boolean elf_s390_create_dynamic_sections
41 PARAMS((bfd *, struct bfd_link_info *));
42static void elf_s390_copy_indirect_symbol
43 PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *));
a85d7ed0
NC		 44static boolean elf_s390_check_relocs
45 PARAMS ((bfd *, struct bfd_link_info *, asection *,
46 const Elf_Internal_Rela *));
5a65713f
AJ		 47static asection *elf_s390_gc_mark_hook
48 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
0451c93c 49 struct elf_link_hash_entry *, Elf_Internal_Sym *));
5a65713f
AJ		 50static boolean elf_s390_gc_sweep_hook
51 PARAMS ((bfd *, struct bfd_link_info *, asection *,
52 const Elf_Internal_Rela *));
a85d7ed0
NC		 53static boolean elf_s390_adjust_dynamic_symbol
54 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
0451c93c
MS		 55static boolean allocate_dynrelocs
56 PARAMS ((struct elf_link_hash_entry *, PTR));
57static boolean readonly_dynrelocs
58 PARAMS ((struct elf_link_hash_entry *, PTR));
a85d7ed0
NC		 59static boolean elf_s390_size_dynamic_sections
60 PARAMS ((bfd *, struct bfd_link_info *));
61static boolean elf_s390_relocate_section
62 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
63 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
64static boolean elf_s390_finish_dynamic_symbol
65 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
66 Elf_Internal_Sym *));
0451c93c
MS		 67static enum elf_reloc_type_class elf_s390_reloc_type_class
68 PARAMS ((const Elf_Internal_Rela *));
a85d7ed0
NC		 69static boolean elf_s390_finish_dynamic_sections
70 PARAMS ((bfd *, struct bfd_link_info *));
5a65713f 71static boolean elf_s390_object_p PARAMS ((bfd *));
248866a8 72static boolean elf_s390_grok_prstatus PARAMS ((bfd *, Elf_Internal_Note *));
a85d7ed0
NC		 73
74#define USE_RELA 1 /* We want RELA relocations, not REL. */
75
76#include "elf/s390.h"
77
78/* The relocation "howto" table. */
79
80static reloc_howto_type elf_howto_table[] =
81{
82 HOWTO (R_390_NONE, /* type */
83 0, /* rightshift */
84 0, /* size (0 = byte, 1 = short, 2 = long) */
85 0, /* bitsize */
86 false, /* pc_relative */
87 0, /* bitpos */
88 complain_overflow_dont, /* complain_on_overflow */
89 bfd_elf_generic_reloc, /* special_function */
90 "R_390_NONE", /* name */
91 false, /* partial_inplace */
92 0, /* src_mask */
93 0, /* dst_mask */
94 false), /* pcrel_offset */
95
96 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
97 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
98 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
99 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
100 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
101 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
102 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
103 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
104 HOWTO(R_390_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
105 HOWTO(R_390_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,0xffffffff, false),
106 HOWTO(R_390_JMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,0xffffffff, false),
107 HOWTO(R_390_RELATIVE, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,0xffffffff, false),
108 HOWTO(R_390_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,0xffffffff, false),
109 HOWTO(R_390_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
110 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
111 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
112 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
113 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
befc3abb
MS		 114 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
115 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
116 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,0xffffffff, true),
117 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,0xffffffff, true),
a85d7ed0
NC		 118};
119
120/* GNU extension to record C++ vtable hierarchy. */
121static reloc_howto_type elf32_s390_vtinherit_howto =
122 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
123static reloc_howto_type elf32_s390_vtentry_howto =
dc810e39 124 HOWTO (R_390_GNU_VTENTRY, 0,2,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
a85d7ed0
NC		 125
126static reloc_howto_type *
127elf_s390_reloc_type_lookup (abfd, code)
128 bfd *abfd ATTRIBUTE_UNUSED;
129 bfd_reloc_code_real_type code;
130{
ec338859 131 switch (code)
0451c93c
MS		 132 {
133 case BFD_RELOC_NONE:
134 return &elf_howto_table[(int) R_390_NONE];
135 case BFD_RELOC_8:
136 return &elf_howto_table[(int) R_390_8];
137 case BFD_RELOC_390_12:
138 return &elf_howto_table[(int) R_390_12];
139 case BFD_RELOC_16:
140 return &elf_howto_table[(int) R_390_16];
141 case BFD_RELOC_32:
142 return &elf_howto_table[(int) R_390_32];
143 case BFD_RELOC_CTOR:
144 return &elf_howto_table[(int) R_390_32];
145 case BFD_RELOC_32_PCREL:
146 return &elf_howto_table[(int) R_390_PC32];
147 case BFD_RELOC_390_GOT12:
148 return &elf_howto_table[(int) R_390_GOT12];
149 case BFD_RELOC_32_GOT_PCREL:
150 return &elf_howto_table[(int) R_390_GOT32];
151 case BFD_RELOC_390_PLT32:
152 return &elf_howto_table[(int) R_390_PLT32];
153 case BFD_RELOC_390_COPY:
154 return &elf_howto_table[(int) R_390_COPY];
155 case BFD_RELOC_390_GLOB_DAT:
156 return &elf_howto_table[(int) R_390_GLOB_DAT];
157 case BFD_RELOC_390_JMP_SLOT:
158 return &elf_howto_table[(int) R_390_JMP_SLOT];
159 case BFD_RELOC_390_RELATIVE:
160 return &elf_howto_table[(int) R_390_RELATIVE];
161 case BFD_RELOC_32_GOTOFF:
162 return &elf_howto_table[(int) R_390_GOTOFF];
163 case BFD_RELOC_390_GOTPC:
164 return &elf_howto_table[(int) R_390_GOTPC];
165 case BFD_RELOC_390_GOT16:
166 return &elf_howto_table[(int) R_390_GOT16];
167 case BFD_RELOC_16_PCREL:
168 return &elf_howto_table[(int) R_390_PC16];
169 case BFD_RELOC_390_PC16DBL:
170 return &elf_howto_table[(int) R_390_PC16DBL];
171 case BFD_RELOC_390_PLT16DBL:
172 return &elf_howto_table[(int) R_390_PLT16DBL];
befc3abb
MS		 173 case BFD_RELOC_390_PC32DBL:
174 return &elf_howto_table[(int) R_390_PC32DBL];
175 case BFD_RELOC_390_PLT32DBL:
176 return &elf_howto_table[(int) R_390_PLT32DBL];
177 case BFD_RELOC_390_GOTPCDBL:
178 return &elf_howto_table[(int) R_390_GOTPCDBL];
179 case BFD_RELOC_390_GOTENT:
180 return &elf_howto_table[(int) R_390_GOTENT];
0451c93c
MS		 181 case BFD_RELOC_VTABLE_INHERIT:
182 return &elf32_s390_vtinherit_howto;
183 case BFD_RELOC_VTABLE_ENTRY:
184 return &elf32_s390_vtentry_howto;
185 default:
186 break;
187 }
a85d7ed0
NC		 188 return 0;
189}
190
191/* We need to use ELF32_R_TYPE so we have our own copy of this function,
192 and elf32-s390.c has its own copy. */
193
194static void
195elf_s390_info_to_howto (abfd, cache_ptr, dst)
196 bfd *abfd ATTRIBUTE_UNUSED;
197 arelent *cache_ptr;
198 Elf_Internal_Rela *dst;
199{
200 switch (ELF32_R_TYPE(dst->r_info))
201 {
202 case R_390_GNU_VTINHERIT:
203 cache_ptr->howto = &elf32_s390_vtinherit_howto;
204 break;
205
206 case R_390_GNU_VTENTRY:
207 cache_ptr->howto = &elf32_s390_vtentry_howto;
208 break;
209
210 default:
211 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
212 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
dc810e39 213 }
a85d7ed0
NC		 214}
215
216static boolean
217elf_s390_is_local_label_name (abfd, name)
218 bfd *abfd;
219 const char *name;
220{
221 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
222 return true;
223
224 return _bfd_elf_is_local_label_name (abfd, name);
225}
226
227/* Functions for the 390 ELF linker. */
228
229/* The name of the dynamic interpreter. This is put in the .interp
230 section. */
231
232#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
233
a85d7ed0
NC		 234/* The size in bytes of the first entry in the procedure linkage table. */
235#define PLT_FIRST_ENTRY_SIZE 32
236/* The size in bytes of an entry in the procedure linkage table. */
dc810e39 237#define PLT_ENTRY_SIZE 32
a85d7ed0
NC		 238
239#define GOT_ENTRY_SIZE 4
240
241/* The first three entries in a procedure linkage table are reserved,
242 and the initial contents are unimportant (we zero them out).
243 Subsequent entries look like this. See the SVR4 ABI 386
244 supplement to see how this works. */
245
246/* For the s390, simple addr offset can only be 0 - 4096.
247 To use the full 2 GB address space, several instructions
248 are needed to load an address in a register and execute
249 a branch( or just saving the address)
250
dc810e39 251 Furthermore, only r 0 and 1 are free to use!!! */
a85d7ed0
NC		 252
253/* The first 3 words in the GOT are then reserved.
254 Word 0 is the address of the dynamic table.
255 Word 1 is a pointer to a structure describing the object
256 Word 2 is used to point to the loader entry address.
257
258 The code for position independand PLT entries looks like this:
259
260 r12 holds addr of the current GOT at entry to the PLT
261
262 The GOT holds the address in the PLT to be executed.
263 The loader then gets:
264 24(15) = Pointer to the structure describing the object.
dc810e39 265 28(15) = Offset in symbol table
a85d7ed0
NC		 266
267 The loader must then find the module where the function is
268 and insert the address in the GOT.
269
270 Note: 390 can only address +- 64 K relative.
271 We check if offset > 65536, then make a relative branch -64xxx
272 back to a previous defined branch
273
274PLT1: BASR 1,0 # 2 bytes
275 L 1,22(1) # 4 bytes Load offset in GOT in r 1
276 L 1,(1,12) # 4 bytes Load address from GOT in r1
277 BCR 15,1 # 2 bytes Jump to address
278RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
279 L 1,14(1) # 4 bytes Load offset in symol table in r1
280 BRC 15,-x # 4 bytes Jump to start of PLT
281 .word 0 # 2 bytes filler
282 .long ? # 4 bytes offset in GOT
283 .long ? # 4 bytes offset into symbol table
284
285 This was the general case. There are two additional, optimizes PLT
286 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
287 First the one for GOT offsets < 4096:
288
289PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
290 BCR 15,1 # 2 bytes Jump to address
291 .word 0,0,0 # 6 bytes filler
292RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
293 L 1,14(1) # 4 bytes Load offset in symbol table in r1
294 BRC 15,-x # 4 bytes Jump to start of PLT
295 .word 0,0,0 # 6 bytes filler
296 .long ? # 4 bytes offset into symbol table
297
298 Second the one for GOT offsets < 32768:
299
300PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
301 L 1,(1,12) # 4 bytes Load address from GOT to r1
302 BCR 15,1 # 2 bytes Jump to address
303 .word 0 # 2 bytes filler
304RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
305 L 1,14(1) # 4 bytes Load offset in symbol table in r1
306 BRC 15,-x # 4 bytes Jump to start of PLT
307 .word 0,0,0 # 6 bytes filler
308 .long ? # 4 bytes offset into symbol table
309
310Total = 32 bytes per PLT entry
311
312 The code for static build PLT entries looks like this:
313
314PLT1: BASR 1,0 # 2 bytes
315 L 1,22(1) # 4 bytes Load address of GOT entry
316 L 1,0(0,1) # 4 bytes Load address from GOT in r1
317 BCR 15,1 # 2 bytes Jump to address
318RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
319 L 1,14(1) # 4 bytes Load offset in symbol table in r1
320 BRC 15,-x # 4 bytes Jump to start of PLT
321 .word 0 # 2 bytes filler
322 .long ? # 4 bytes address of GOT entry
323 .long ? # 4 bytes offset into symbol table */
324
325#define PLT_PIC_ENTRY_WORD0 0x0d105810
326#define PLT_PIC_ENTRY_WORD1 0x10165811
327#define PLT_PIC_ENTRY_WORD2 0xc00007f1
328#define PLT_PIC_ENTRY_WORD3 0x0d105810
329#define PLT_PIC_ENTRY_WORD4 0x100ea7f4
330
331#define PLT_PIC12_ENTRY_WORD0 0x5810c000
332#define PLT_PIC12_ENTRY_WORD1 0x07f10000
333#define PLT_PIC12_ENTRY_WORD2 0x00000000
334#define PLT_PIC12_ENTRY_WORD3 0x0d105810
335#define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
336
337#define PLT_PIC16_ENTRY_WORD0 0xa7180000
338#define PLT_PIC16_ENTRY_WORD1 0x5811c000
339#define PLT_PIC16_ENTRY_WORD2 0x07f10000
340#define PLT_PIC16_ENTRY_WORD3 0x0d105810
341#define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
342
343#define PLT_ENTRY_WORD0 0x0d105810
344#define PLT_ENTRY_WORD1 0x10165810
345#define PLT_ENTRY_WORD2 0x100007f1
346#define PLT_ENTRY_WORD3 0x0d105810
347#define PLT_ENTRY_WORD4 0x100ea7f4
348
349/* The first PLT entry pushes the offset into the symbol table
350 from R1 onto the stack at 8(15) and the loader object info
351 at 12(15), loads the loader address in R1 and jumps to it. */
352
353/* The first entry in the PLT for PIC code:
354
355PLT0:
356 ST 1,28(15) # R1 has offset into symbol table
357 L 1,4(12) # Get loader ino(object struct address)
dc810e39 358 ST 1,24(15) # Store address
a85d7ed0
NC		 359 L 1,8(12) # Entry address of loader in R1
360 BR 1 # Jump to loader
361
362 The first entry in the PLT for static code:
363
364PLT0:
365 ST 1,28(15) # R1 has offset into symbol table
366 BASR 1,0
367 L 1,18(0,1) # Get address of GOT
368 MVC 24(4,15),4(1) # Move loader ino to stack
369 L 1,8(1) # Get address of loader
370 BR 1 # Jump to loader
371 .word 0 # filler
372 .long got # address of GOT */
373
374#define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
375#define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
376#define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
377#define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
378#define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
379
380#define PLT_FIRST_ENTRY_WORD0 0x5010f01c
381#define PLT_FIRST_ENTRY_WORD1 0x0d105810
382#define PLT_FIRST_ENTRY_WORD2 0x1012D203
383#define PLT_FIRST_ENTRY_WORD3 0xf0181004
384#define PLT_FIRST_ENTRY_WORD4 0x58101008
385#define PLT_FIRST_ENTRY_WORD5 0x07f10000
386
387/* The s390 linker needs to keep track of the number of relocs that it
0451c93c
MS		 388 decides to copy as dynamic relocs in check_relocs for each symbol.
389 This is so that it can later discard them if they are found to be
390 unnecessary. We store the information in a field extending the
391 regular ELF linker hash table. */
a85d7ed0 392
0451c93c 393struct elf_s390_dyn_relocs
a85d7ed0 394{
0451c93c
MS		 395 struct elf_s390_dyn_relocs *next;
396
397 /* The input section of the reloc. */
398 asection *sec;
399
400 /* Total number of relocs copied for the input section. */
a85d7ed0 401 bfd_size_type count;
0451c93c
MS		 402
403 /* Number of pc-relative relocs copied for the input section. */
404 bfd_size_type pc_count;
a85d7ed0
NC		 405};
406
407/* s390 ELF linker hash entry. */
408
409struct elf_s390_link_hash_entry
410{
0451c93c 411 struct elf_link_hash_entry elf;
a85d7ed0 412
0451c93c
MS		 413 /* Track dynamic relocs copied for this symbol. */
414 struct elf_s390_dyn_relocs *dyn_relocs;
a85d7ed0
NC		 415};
416
417/* s390 ELF linker hash table. */
418
419struct elf_s390_link_hash_table
420{
0451c93c 421 struct elf_link_hash_table elf;
a85d7ed0 422
0451c93c
MS		 423 /* Short-cuts to get to dynamic linker sections. */
424 asection *sgot;
425 asection *sgotplt;
426 asection *srelgot;
427 asection *splt;
428 asection *srelplt;
429 asection *sdynbss;
430 asection *srelbss;
ec338859
AM		 431
432 /* Small local sym to section mapping cache. */
433 struct sym_sec_cache sym_sec;
0451c93c 434};
a85d7ed0
NC		 435
436/* Get the s390 ELF linker hash table from a link_info structure. */
437
438#define elf_s390_hash_table(p) \
439 ((struct elf_s390_link_hash_table *) ((p)->hash))
440
441/* Create an entry in an s390 ELF linker hash table. */
442
443static struct bfd_hash_entry *
0451c93c 444link_hash_newfunc (entry, table, string)
a85d7ed0
NC		 445 struct bfd_hash_entry *entry;
446 struct bfd_hash_table *table;
447 const char *string;
448{
a85d7ed0
NC		 449 /* Allocate the structure if it has not already been allocated by a
450 subclass. */
0451c93c
MS		 451 if (entry == NULL)
452 {
453 entry = bfd_hash_allocate (table,
454 sizeof (struct elf_s390_link_hash_entry));
455 if (entry == NULL)
456 return entry;
457 }
ec338859 458
a85d7ed0 459 /* Call the allocation method of the superclass. */
0451c93c
MS		 460 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
461 if (entry != NULL)
a85d7ed0 462 {
0451c93c 463 struct elf_s390_link_hash_entry *eh;
ec338859 464
0451c93c
MS		 465 eh = (struct elf_s390_link_hash_entry *) entry;
466 eh->dyn_relocs = NULL;
a85d7ed0
NC		 467 }
468
0451c93c 469 return entry;
a85d7ed0
NC		 470}
471
472/* Create an s390 ELF linker hash table. */
473
474static struct bfd_link_hash_table *
475elf_s390_link_hash_table_create (abfd)
476 bfd *abfd;
477{
478 struct elf_s390_link_hash_table *ret;
dc810e39 479 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
a85d7ed0 480
e2d34d7d 481 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
0451c93c 482 if (ret == NULL)
a85d7ed0
NC		 483 return NULL;
484
0451c93c 485 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
a85d7ed0 486 {
e2d34d7d 487 free (ret);
a85d7ed0
NC		 488 return NULL;
489 }
490
0451c93c
MS		 491 ret->sgot = NULL;
492 ret->sgotplt = NULL;
493 ret->srelgot = NULL;
494 ret->splt = NULL;
495 ret->srelplt = NULL;
496 ret->sdynbss = NULL;
497 ret->srelbss = NULL;
ec338859 498 ret->sym_sec.abfd = NULL;
0451c93c
MS		 499
500 return &ret->elf.root;
501}
502
503/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
504 shortcuts to them in our hash table. */
505
506static boolean
507create_got_section (dynobj, info)
508 bfd *dynobj;
509 struct bfd_link_info *info;
510{
511 struct elf_s390_link_hash_table *htab;
512
513 if (! _bfd_elf_create_got_section (dynobj, info))
514 return false;
515
516 htab = elf_s390_hash_table (info);
517 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
518 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
519 if (!htab->sgot || !htab->sgotplt)
520 abort ();
521
522 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
523 if (htab->srelgot == NULL
524 || ! bfd_set_section_flags (dynobj, htab->srelgot,
525 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
526 | SEC_IN_MEMORY | SEC_LINKER_CREATED
527 | SEC_READONLY))
528 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
529 return false;
530 return true;
531}
532
533/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
534 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
535 hash table. */
536
537static boolean
538elf_s390_create_dynamic_sections (dynobj, info)
539 bfd *dynobj;
540 struct bfd_link_info *info;
541{
542 struct elf_s390_link_hash_table *htab;
543
544 htab = elf_s390_hash_table (info);
545 if (!htab->sgot && !create_got_section (dynobj, info))
546 return false;
547
548 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
549 return false;
550
551 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
552 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
553 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
554 if (!info->shared)
555 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
556
557 if (!htab->splt || !htab->srelplt || !htab->sdynbss
558 || (!info->shared && !htab->srelbss))
559 abort ();
560
561 return true;
a85d7ed0
NC		 562}
563
0451c93c
MS		 564/* Copy the extra info we tack onto an elf_link_hash_entry. */
565
566static void
567elf_s390_copy_indirect_symbol (dir, ind)
568 struct elf_link_hash_entry *dir, *ind;
569{
570 struct elf_s390_link_hash_entry *edir, *eind;
571
572 edir = (struct elf_s390_link_hash_entry *) dir;
573 eind = (struct elf_s390_link_hash_entry *) ind;
574
575 if (eind->dyn_relocs != NULL)
576 {
577 if (edir->dyn_relocs != NULL)
578 {
579 struct elf_s390_dyn_relocs **pp;
580 struct elf_s390_dyn_relocs *p;
581
582 if (ind->root.type == bfd_link_hash_indirect)
583 abort ();
584
585 /* Add reloc counts against the weak sym to the strong sym
586 list. Merge any entries against the same section. */
587 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
588 {
589 struct elf_s390_dyn_relocs *q;
590
591 for (q = edir->dyn_relocs; q != NULL; q = q->next)
592 if (q->sec == p->sec)
593 {
594 q->pc_count += p->pc_count;
595 q->count += p->count;
596 *pp = p->next;
597 break;
598 }
599 if (q == NULL)
600 pp = &p->next;
601 }
602 *pp = edir->dyn_relocs;
603 }
604
605 edir->dyn_relocs = eind->dyn_relocs;
606 eind->dyn_relocs = NULL;
607 }
608
609 _bfd_elf_link_hash_copy_indirect (dir, ind);
610}
a85d7ed0
NC		 611
612/* Look through the relocs for a section during the first phase, and
613 allocate space in the global offset table or procedure linkage
614 table. */
615
616static boolean
617elf_s390_check_relocs (abfd, info, sec, relocs)
618 bfd *abfd;
619 struct bfd_link_info *info;
620 asection *sec;
621 const Elf_Internal_Rela *relocs;
622{
0451c93c 623 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 624 Elf_Internal_Shdr *symtab_hdr;
625 struct elf_link_hash_entry **sym_hashes;
a85d7ed0
NC		 626 const Elf_Internal_Rela *rel;
627 const Elf_Internal_Rela *rel_end;
a85d7ed0
NC		 628 asection *sreloc;
629
630 if (info->relocateable)
631 return true;
632
0451c93c 633 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 634 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
635 sym_hashes = elf_sym_hashes (abfd);
a85d7ed0 636
a85d7ed0
NC		 637 sreloc = NULL;
638
639 rel_end = relocs + sec->reloc_count;
640 for (rel = relocs; rel < rel_end; rel++)
641 {
642 unsigned long r_symndx;
643 struct elf_link_hash_entry *h;
644
645 r_symndx = ELF32_R_SYM (rel->r_info);
646
0451c93c
MS		 647 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
648 {
649 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
650 bfd_archive_filename (abfd),
651 r_symndx);
652 return false;
653 }
654
a85d7ed0
NC		 655 if (r_symndx < symtab_hdr->sh_info)
656 h = NULL;
657 else
dc810e39 658 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
a85d7ed0 659
a85d7ed0
NC		 660 switch (ELF32_R_TYPE (rel->r_info))
661 {
662 case R_390_GOT12:
663 case R_390_GOT16:
664 case R_390_GOT32:
befc3abb 665 case R_390_GOTENT:
a85d7ed0 666 /* This symbol requires a global offset table entry. */
a85d7ed0
NC		 667 if (h != NULL)
668 {
51b64d56 669 h->got.refcount += 1;
a85d7ed0
NC		 670 }
671 else
672 {
0451c93c
MS		 673 bfd_signed_vma *local_got_refcounts;
674
a85d7ed0 675 /* This is a global offset table entry for a local symbol. */
0451c93c 676 local_got_refcounts = elf_local_got_refcounts (abfd);
a85d7ed0
NC		 677 if (local_got_refcounts == NULL)
678 {
dc810e39 679 bfd_size_type size;
a85d7ed0 680
dc810e39
AM		 681 size = symtab_hdr->sh_info;
682 size *= sizeof (bfd_signed_vma);
0451c93c
MS		 683 local_got_refcounts = ((bfd_signed_vma *)
684 bfd_zalloc (abfd, size));
a85d7ed0
NC		 685 if (local_got_refcounts == NULL)
686 return false;
687 elf_local_got_refcounts (abfd) = local_got_refcounts;
a85d7ed0 688 }
51b64d56 689 local_got_refcounts[r_symndx] += 1;
a85d7ed0 690 }
0451c93c
MS		 691 /* Fall through */
692
693 case R_390_GOTOFF:
694 case R_390_GOTPC:
befc3abb 695 case R_390_GOTPCDBL:
0451c93c
MS		 696 if (htab->sgot == NULL)
697 {
698 if (htab->elf.dynobj == NULL)
699 htab->elf.dynobj = abfd;
700 if (!create_got_section (htab->elf.dynobj, info))
701 return false;
702 }
a85d7ed0
NC		 703 break;
704
705 case R_390_PLT16DBL:
befc3abb 706 case R_390_PLT32DBL:
a85d7ed0
NC		 707 case R_390_PLT32:
708 /* This symbol requires a procedure linkage table entry. We
709 actually build the entry in adjust_dynamic_symbol,
710 because this might be a case of linking PIC code which is
711 never referenced by a dynamic object, in which case we
712 don't need to generate a procedure linkage table entry
713 after all. */
714
715 /* If this is a local symbol, we resolve it directly without
716 creating a procedure linkage table entry. */
717 if (h == NULL)
718 continue;
719
51b64d56
AM		 720 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
721 h->plt.refcount += 1;
a85d7ed0
NC		 722 break;
723
724 case R_390_8:
725 case R_390_16:
726 case R_390_32:
727 case R_390_PC16:
728 case R_390_PC16DBL:
befc3abb 729 case R_390_PC32DBL:
a85d7ed0 730 case R_390_PC32:
0451c93c
MS		 731 if (h != NULL && !info->shared)
732 {
733 /* If this reloc is in a read-only section, we might
734 need a copy reloc. We can't check reliably at this
735 stage whether the section is read-only, as input
736 sections have not yet been mapped to output sections.
737 Tentatively set the flag for now, and correct in
738 adjust_dynamic_symbol. */
739 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
ec338859 740
0451c93c
MS		 741 /* We may need a .plt entry if the function this reloc
742 refers to is in a shared lib. */
743 h->plt.refcount += 1;
744 }
a85d7ed0
NC		 745
746 /* If we are creating a shared library, and this is a reloc
0451c93c
MS		 747 against a global symbol, or a non PC relative reloc
748 against a local symbol, then we need to copy the reloc
749 into the shared library. However, if we are linking with
750 -Bsymbolic, we do not need to copy a reloc against a
751 global symbol which is defined in an object we are
752 including in the link (i.e., DEF_REGULAR is set). At
753 this point we have not seen all the input files, so it is
754 possible that DEF_REGULAR is not set now but will be set
755 later (it is never cleared). In case of a weak definition,
756 DEF_REGULAR may be cleared later by a strong definition in
757 a shared library. We account for that possibility below by
758 storing information in the relocs_copied field of the hash
759 table entry. A similar situation occurs when creating
760 shared libraries and symbol visibility changes render the
761 symbol local.
762
763 If on the other hand, we are creating an executable, we
764 may need to keep relocations for symbols satisfied by a
765 dynamic library if we manage to avoid copy relocs for the
766 symbol. */
767 if ((info->shared
768 && (sec->flags & SEC_ALLOC) != 0
ec338859 769 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
0451c93c 770 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
befc3abb 771 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
0451c93c
MS		 772 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
773 || (h != NULL
774 && (! info->symbolic
775 || h->root.type == bfd_link_hash_defweak
776 || (h->elf_link_hash_flags
777 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
778 || (!info->shared
779 && (sec->flags & SEC_ALLOC) != 0
780 && h != NULL
781 && (h->root.type == bfd_link_hash_defweak
782 || (h->elf_link_hash_flags
783 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
a85d7ed0 784 {
ec338859
AM		 785 struct elf_s390_dyn_relocs *p;
786 struct elf_s390_dyn_relocs **head;
787
0451c93c
MS		 788 /* We must copy these reloc types into the output file.
789 Create a reloc section in dynobj and make room for
790 this reloc. */
a85d7ed0
NC		 791 if (sreloc == NULL)
792 {
793 const char *name;
0451c93c 794 bfd *dynobj;
ec338859 795
a85d7ed0
NC		 796 name = (bfd_elf_string_from_elf_section
797 (abfd,
798 elf_elfheader (abfd)->e_shstrndx,
799 elf_section_data (sec)->rel_hdr.sh_name));
800 if (name == NULL)
801 return false;
802
0451c93c
MS		 803 if (strncmp (name, ".rela", 5) != 0
804 || strcmp (bfd_get_section_name (abfd, sec),
805 name + 5) != 0)
806 {
807 (*_bfd_error_handler)
808 (_("%s: bad relocation section name `%s\'"),
809 bfd_archive_filename (abfd), name);
810 }
811
812 if (htab->elf.dynobj == NULL)
813 htab->elf.dynobj = abfd;
a85d7ed0 814
0451c93c 815 dynobj = htab->elf.dynobj;
a85d7ed0
NC		 816 sreloc = bfd_get_section_by_name (dynobj, name);
817 if (sreloc == NULL)
818 {
819 flagword flags;
820
821 sreloc = bfd_make_section (dynobj, name);
822 flags = (SEC_HAS_CONTENTS | SEC_READONLY
823 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
824 if ((sec->flags & SEC_ALLOC) != 0)
825 flags |= SEC_ALLOC | SEC_LOAD;
826 if (sreloc == NULL
827 || ! bfd_set_section_flags (dynobj, sreloc, flags)
828 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
829 return false;
830 }
0451c93c 831 elf_section_data (sec)->sreloc = sreloc;
a85d7ed0
NC		 832 }
833
0451c93c
MS		 834 /* If this is a global symbol, we count the number of
835 relocations we need for this symbol. */
836 if (h != NULL)
a85d7ed0 837 {
ec338859 838 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
0451c93c
MS		 839 }
840 else
841 {
ec338859
AM		 842 /* Track dynamic relocs needed for local syms too.
843 We really need local syms available to do this
844 easily. Oh well. */
845
846 asection *s;
847 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
848 sec, r_symndx);
849 if (s == NULL)
850 return false;
851
852 head = ((struct elf_s390_dyn_relocs **)
853 &elf_section_data (s)->local_dynrel);
854 }
855
856 p = *head;
857 if (p == NULL || p->sec != sec)
858 {
859 bfd_size_type amt = sizeof *p;
860 p = ((struct elf_s390_dyn_relocs *)
861 bfd_alloc (htab->elf.dynobj, amt));
862 if (p == NULL)
863 return false;
864 p->next = *head;
865 *head = p;
866 p->sec = sec;
867 p->count = 0;
868 p->pc_count = 0;
a85d7ed0 869 }
ec338859
AM		 870
871 p->count += 1;
872 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
873 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
befc3abb 874 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
ec338859
AM		 875 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
876 p->pc_count += 1;
a85d7ed0 877 }
a85d7ed0 878 break;
ec338859 879
a85d7ed0
NC		 880 /* This relocation describes the C++ object vtable hierarchy.
881 Reconstruct it for later use during GC. */
882 case R_390_GNU_VTINHERIT:
883 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
884 return false;
885 break;
ec338859 886
a85d7ed0
NC		 887 /* This relocation describes which C++ vtable entries are actually
888 used. Record for later use during GC. */
889 case R_390_GNU_VTENTRY:
db727808 890 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
a85d7ed0
NC		 891 return false;
892 break;
ec338859 893
a85d7ed0
NC		 894 default:
895 break;
896 }
897 }
898
899 return true;
900}
901
902/* Return the section that should be marked against GC for a given
903 relocation. */
904
905static asection *
906elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
907 bfd *abfd;
908 struct bfd_link_info *info ATTRIBUTE_UNUSED;
909 Elf_Internal_Rela *rel;
910 struct elf_link_hash_entry *h;
911 Elf_Internal_Sym *sym;
912{
913 if (h != NULL)
914 {
915 switch (ELF32_R_TYPE (rel->r_info))
916 {
917 case R_390_GNU_VTINHERIT:
918 case R_390_GNU_VTENTRY:
919 break;
920
921 default:
922 switch (h->root.type)
923 {
924 case bfd_link_hash_defined:
925 case bfd_link_hash_defweak:
926 return h->root.u.def.section;
927
928 case bfd_link_hash_common:
929 return h->root.u.c.p->section;
930
931 default:
932 break;
933 }
934 }
935 }
936 else
937 {
9ad5cbcf 938 return bfd_section_from_elf_index (abfd, sym->st_shndx);
a85d7ed0
NC		 939 }
940
941 return NULL;
942}
943
944/* Update the got entry reference counts for the section being removed. */
945
946static boolean
947elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
0451c93c
MS		 948 bfd *abfd;
949 struct bfd_link_info *info;
950 asection *sec;
951 const Elf_Internal_Rela *relocs;
a85d7ed0
NC		 952{
953 Elf_Internal_Shdr *symtab_hdr;
954 struct elf_link_hash_entry **sym_hashes;
955 bfd_signed_vma *local_got_refcounts;
956 const Elf_Internal_Rela *rel, *relend;
957 unsigned long r_symndx;
958 struct elf_link_hash_entry *h;
a85d7ed0 959
ec338859 960 elf_section_data (sec)->local_dynrel = NULL;
a85d7ed0 961
0451c93c
MS		 962 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
963 sym_hashes = elf_sym_hashes (abfd);
964 local_got_refcounts = elf_local_got_refcounts (abfd);
a85d7ed0
NC		 965
966 relend = relocs + sec->reloc_count;
967 for (rel = relocs; rel < relend; rel++)
968 switch (ELF32_R_TYPE (rel->r_info))
969 {
970 case R_390_GOT12:
971 case R_390_GOT16:
972 case R_390_GOT32:
973 case R_390_GOTOFF:
974 case R_390_GOTPC:
befc3abb
MS		 975 case R_390_GOTPCDBL:
976 case R_390_GOTENT:
a85d7ed0
NC		 977 r_symndx = ELF32_R_SYM (rel->r_info);
978 if (r_symndx >= symtab_hdr->sh_info)
979 {
980 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
981 if (h->got.refcount > 0)
0451c93c 982 h->got.refcount -= 1;
a85d7ed0
NC		 983 }
984 else if (local_got_refcounts != NULL)
985 {
986 if (local_got_refcounts[r_symndx] > 0)
0451c93c
MS		 987 local_got_refcounts[r_symndx] -= 1;
988 }
989 break;
990
991 case R_390_8:
992 case R_390_12:
993 case R_390_16:
994 case R_390_32:
995 case R_390_PC16:
996 case R_390_PC16DBL:
befc3abb 997 case R_390_PC32DBL:
0451c93c
MS		 998 case R_390_PC32:
999 r_symndx = ELF32_R_SYM (rel->r_info);
1000 if (r_symndx >= symtab_hdr->sh_info)
1001 {
1002 struct elf_s390_link_hash_entry *eh;
1003 struct elf_s390_dyn_relocs **pp;
1004 struct elf_s390_dyn_relocs *p;
1005
1006 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1007
1008 if (!info->shared && h->plt.refcount > 0)
1009 h->plt.refcount -= 1;
1010
1011 eh = (struct elf_s390_link_hash_entry *) h;
1012
1013 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1014 if (p->sec == sec)
1015 {
1016 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1017 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
befc3abb 1018 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
0451c93c
MS		 1019 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1020 p->pc_count -= 1;
1021 p->count -= 1;
1022 if (p->count == 0)
1023 *pp = p->next;
1024 break;
1025 }
a85d7ed0
NC		 1026 }
1027 break;
1028
1029 case R_390_PLT16DBL:
befc3abb 1030 case R_390_PLT32DBL:
a85d7ed0
NC		 1031 case R_390_PLT32:
1032 r_symndx = ELF32_R_SYM (rel->r_info);
1033 if (r_symndx >= symtab_hdr->sh_info)
1034 {
1035 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1036 if (h->plt.refcount > 0)
1037 h->plt.refcount -= 1;
1038 }
1039 break;
1040
1041 default:
1042 break;
1043 }
1044
1045 return true;
1046}
1047
1048/* Adjust a symbol defined by a dynamic object and referenced by a
1049 regular object. The current definition is in some section of the
1050 dynamic object, but we're not including those sections. We have to
1051 change the definition to something the rest of the link can
1052 understand. */
1053
1054static boolean
1055elf_s390_adjust_dynamic_symbol (info, h)
1056 struct bfd_link_info *info;
1057 struct elf_link_hash_entry *h;
1058{
0451c93c
MS		 1059 struct elf_s390_link_hash_table *htab;
1060 struct elf_s390_link_hash_entry * eh;
1061 struct elf_s390_dyn_relocs *p;
a85d7ed0
NC		 1062 asection *s;
1063 unsigned int power_of_two;
1064
a85d7ed0
NC		 1065 /* If this is a function, put it in the procedure linkage table. We
1066 will fill in the contents of the procedure linkage table later
1067 (although we could actually do it here). */
1068 if (h->type == STT_FUNC
1069 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1070 {
0451c93c
MS		 1071 if (h->plt.refcount <= 0
1072 || (! info->shared
1073 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
f9cd9119
MS		 1074 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1075 && h->root.type != bfd_link_hash_undefweak
1076 && h->root.type != bfd_link_hash_undefined))
a85d7ed0
NC		 1077 {
1078 /* This case can occur if we saw a PLT32 reloc in an input
1079 file, but the symbol was never referred to by a dynamic
1080 object, or if all references were garbage collected. In
1081 such a case, we don't actually need to build a procedure
1082 linkage table, and we can just do a PC32 reloc instead. */
1083 h->plt.offset = (bfd_vma) -1;
1084 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
a85d7ed0
NC		 1085 }
1086
a85d7ed0
NC		 1087 return true;
1088 }
bbd7ec4a 1089 else
0451c93c
MS		 1090 /* It's possible that we incorrectly decided a .plt reloc was
1091 needed for an R_390_PC32 reloc to a non-function sym in
1092 check_relocs. We can't decide accurately between function and
1093 non-function syms in check-relocs; Objects loaded later in
1094 the link may change h->type. So fix it now. */
bbd7ec4a 1095 h->plt.offset = (bfd_vma) -1;
a85d7ed0
NC		 1096
1097 /* If this is a weak symbol, and there is a real definition, the
1098 processor independent code will have arranged for us to see the
1099 real definition first, and we can just use the same value. */
1100 if (h->weakdef != NULL)
1101 {
1102 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1103 || h->weakdef->root.type == bfd_link_hash_defweak);
1104 h->root.u.def.section = h->weakdef->root.u.def.section;
1105 h->root.u.def.value = h->weakdef->root.u.def.value;
1106 return true;
1107 }
1108
1109 /* This is a reference to a symbol defined by a dynamic object which
1110 is not a function. */
1111
1112 /* If we are creating a shared library, we must presume that the
1113 only references to the symbol are via the global offset table.
1114 For such cases we need not do anything here; the relocations will
1115 be handled correctly by relocate_section. */
1116 if (info->shared)
1117 return true;
1118
1119 /* If there are no references to this symbol that do not use the
1120 GOT, we don't need to generate a copy reloc. */
1121 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1122 return true;
1123
0451c93c
MS		 1124 /* If -z nocopyreloc was given, we won't generate them either. */
1125 if (info->nocopyreloc)
1126 {
1127 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1128 return true;
1129 }
1130
1131 eh = (struct elf_s390_link_hash_entry *) h;
1132 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1133 {
1134 s = p->sec->output_section;
1135 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1136 break;
1137 }
1138
1139 /* If we didn't find any dynamic relocs in read-only sections, then
ec338859 1140 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
0451c93c
MS		 1141 if (p == NULL)
1142 {
1143 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1144 return true;
1145 }
1146
a85d7ed0
NC		 1147 /* We must allocate the symbol in our .dynbss section, which will
1148 become part of the .bss section of the executable. There will be
1149 an entry for this symbol in the .dynsym section. The dynamic
1150 object will contain position independent code, so all references
1151 from the dynamic object to this symbol will go through the global
1152 offset table. The dynamic linker will use the .dynsym entry to
1153 determine the address it must put in the global offset table, so
1154 both the dynamic object and the regular object will refer to the
1155 same memory location for the variable. */
1156
0451c93c 1157 htab = elf_s390_hash_table (info);
a85d7ed0 1158
0451c93c
MS		 1159 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1160 copy the initial value out of the dynamic object and into the
1161 runtime process image. */
a85d7ed0
NC		 1162 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1163 {
0451c93c 1164 htab->srelbss->_raw_size += sizeof (Elf32_External_Rela);
a85d7ed0
NC		 1165 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1166 }
1167
1168 /* We need to figure out the alignment required for this symbol. I
1169 have no idea how ELF linkers handle this. */
1170 power_of_two = bfd_log2 (h->size);
1171 if (power_of_two > 3)
1172 power_of_two = 3;
1173
1174 /* Apply the required alignment. */
0451c93c
MS		 1175 s = htab->sdynbss;
1176 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1177 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
a85d7ed0 1178 {
0451c93c 1179 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
a85d7ed0
NC		 1180 return false;
1181 }
1182
1183 /* Define the symbol as being at this point in the section. */
1184 h->root.u.def.section = s;
1185 h->root.u.def.value = s->_raw_size;
1186
1187 /* Increment the section size to make room for the symbol. */
1188 s->_raw_size += h->size;
1189
1190 return true;
1191}
1192
0451c93c
MS		 1193/* This is the condition under which elf_s390_finish_dynamic_symbol
1194 will be called from elflink.h. If elflink.h doesn't call our
1195 finish_dynamic_symbol routine, we'll need to do something about
1196 initializing any .plt and .got entries in elf_s390_relocate_section. */
1197#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1198 ((DYN) \
1199 && ((INFO)->shared \
1200 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1201 && ((H)->dynindx != -1 \
1202 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1203
1204/* Allocate space in .plt, .got and associated reloc sections for
1205 dynamic relocs. */
1206
1207static boolean
1208allocate_dynrelocs (h, inf)
1209 struct elf_link_hash_entry *h;
1210 PTR inf;
1211{
1212 struct bfd_link_info *info;
1213 struct elf_s390_link_hash_table *htab;
1214 struct elf_s390_link_hash_entry *eh;
1215 struct elf_s390_dyn_relocs *p;
1216
e92d460e 1217 if (h->root.type == bfd_link_hash_indirect)
0451c93c
MS		 1218 return true;
1219
e92d460e
AM		 1220 if (h->root.type == bfd_link_hash_warning)
1221 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1222
0451c93c
MS		 1223 info = (struct bfd_link_info *) inf;
1224 htab = elf_s390_hash_table (info);
1225
1226 if (htab->elf.dynamic_sections_created
1227 && h->plt.refcount > 0)
1228 {
1229 /* Make sure this symbol is output as a dynamic symbol.
1230 Undefined weak syms won't yet be marked as dynamic. */
1231 if (h->dynindx == -1
1232 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1233 {
1234 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1235 return false;
1236 }
1237
1238 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
1239 {
1240 asection *s = htab->splt;
1241
1242 /* If this is the first .plt entry, make room for the special
1243 first entry. */
1244 if (s->_raw_size == 0)
1245 s->_raw_size += PLT_FIRST_ENTRY_SIZE;
1246
1247 h->plt.offset = s->_raw_size;
1248
1249 /* If this symbol is not defined in a regular file, and we are
1250 not generating a shared library, then set the symbol to this
1251 location in the .plt. This is required to make function
1252 pointers compare as equal between the normal executable and
1253 the shared library. */
1254 if (! info->shared
1255 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1256 {
1257 h->root.u.def.section = s;
1258 h->root.u.def.value = h->plt.offset;
1259 }
ec338859 1260
0451c93c
MS		 1261 /* Make room for this entry. */
1262 s->_raw_size += PLT_ENTRY_SIZE;
ec338859 1263
0451c93c
MS		 1264 /* We also need to make an entry in the .got.plt section, which
1265 will be placed in the .got section by the linker script. */
1266 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
1267
1268 /* We also need to make an entry in the .rela.plt section. */
1269 htab->srelplt->_raw_size += sizeof (Elf32_External_Rela);
1270 }
1271 else
1272 {
1273 h->plt.offset = (bfd_vma) -1;
1274 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1275 }
ec338859 1276 }
0451c93c
MS		 1277 else
1278 {
1279 h->plt.offset = (bfd_vma) -1;
1280 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
ec338859
AM		 1281 }
1282
0451c93c
MS		 1283 if (h->got.refcount > 0)
1284 {
1285 asection *s;
1286 boolean dyn;
1287
1288 /* Make sure this symbol is output as a dynamic symbol.
1289 Undefined weak syms won't yet be marked as dynamic. */
1290 if (h->dynindx == -1
1291 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1292 {
1293 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1294 return false;
1295 }
1296
1297 s = htab->sgot;
1298 h->got.offset = s->_raw_size;
1299 s->_raw_size += GOT_ENTRY_SIZE;
1300 dyn = htab->elf.dynamic_sections_created;
1301 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
1302 htab->srelgot->_raw_size += sizeof (Elf32_External_Rela);
1303 }
1304 else
1305 h->got.offset = (bfd_vma) -1;
1306
1307 eh = (struct elf_s390_link_hash_entry *) h;
1308 if (eh->dyn_relocs == NULL)
1309 return true;
1310
1311 /* In the shared -Bsymbolic case, discard space allocated for
1312 dynamic pc-relative relocs against symbols which turn out to be
1313 defined in regular objects. For the normal shared case, discard
1314 space for pc-relative relocs that have become local due to symbol
1315 visibility changes. */
1316
1317 if (info->shared)
1318 {
1319 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1320 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1321 || info->symbolic))
1322 {
1323 struct elf_s390_dyn_relocs **pp;
1324
1325 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1326 {
1327 p->count -= p->pc_count;
1328 p->pc_count = 0;
1329 if (p->count == 0)
1330 *pp = p->next;
1331 else
1332 pp = &p->next;
1333 }
1334 }
1335 }
1336 else
1337 {
1338 /* For the non-shared case, discard space for relocs against
1339 symbols which turn out to need copy relocs or are not
1340 dynamic. */
1341
1342 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1343 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1344 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1345 || (htab->elf.dynamic_sections_created
1346 && (h->root.type == bfd_link_hash_undefweak
1347 || h->root.type == bfd_link_hash_undefined))))
1348 {
1349 /* Make sure this symbol is output as a dynamic symbol.
1350 Undefined weak syms won't yet be marked as dynamic. */
1351 if (h->dynindx == -1
1352 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1353 {
1354 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1355 return false;
1356 }
1357
1358 /* If that succeeded, we know we'll be keeping all the
1359 relocs. */
1360 if (h->dynindx != -1)
1361 goto keep;
1362 }
1363
1364 eh->dyn_relocs = NULL;
1365
ec338859 1366 keep: ;
0451c93c
MS		 1367 }
1368
1369 /* Finally, allocate space. */
1370 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1371 {
1372 asection *sreloc = elf_section_data (p->sec)->sreloc;
1373 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rela);
1374 }
1375
1376 return true;
1377}
1378
1379/* Find any dynamic relocs that apply to read-only sections. */
1380
1381static boolean
1382readonly_dynrelocs (h, inf)
1383 struct elf_link_hash_entry *h;
1384 PTR inf;
1385{
1386 struct elf_s390_link_hash_entry *eh;
1387 struct elf_s390_dyn_relocs *p;
1388
e92d460e
AM		 1389 if (h->root.type == bfd_link_hash_warning)
1390 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1391
0451c93c
MS		 1392 eh = (struct elf_s390_link_hash_entry *) h;
1393 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1394 {
1395 asection *s = p->sec->output_section;
1396
1397 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1398 {
1399 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1400
1401 info->flags |= DF_TEXTREL;
1402
1403 /* Not an error, just cut short the traversal. */
1404 return false;
1405 }
1406 }
1407 return true;
1408}
1409
a85d7ed0
NC		 1410/* Set the sizes of the dynamic sections. */
1411
1412static boolean
1413elf_s390_size_dynamic_sections (output_bfd, info)
29c2fb7c 1414 bfd *output_bfd ATTRIBUTE_UNUSED;
a85d7ed0
NC		 1415 struct bfd_link_info *info;
1416{
0451c93c 1417 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 1418 bfd *dynobj;
1419 asection *s;
a85d7ed0 1420 boolean relocs;
0451c93c 1421 bfd *ibfd;
a85d7ed0 1422
0451c93c
MS		 1423 htab = elf_s390_hash_table (info);
1424 dynobj = htab->elf.dynobj;
1425 if (dynobj == NULL)
1426 abort ();
a85d7ed0 1427
0451c93c 1428 if (htab->elf.dynamic_sections_created)
a85d7ed0
NC		 1429 {
1430 /* Set the contents of the .interp section to the interpreter. */
1431 if (! info->shared)
1432 {
1433 s = bfd_get_section_by_name (dynobj, ".interp");
0451c93c
MS		 1434 if (s == NULL)
1435 abort ();
a85d7ed0
NC		 1436 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1437 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1438 }
1439 }
a85d7ed0 1440
0451c93c
MS		 1441 /* Set up .got offsets for local syms, and space for local dynamic
1442 relocs. */
1443 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
a85d7ed0 1444 {
0451c93c
MS		 1445 bfd_signed_vma *local_got;
1446 bfd_signed_vma *end_local_got;
1447 bfd_size_type locsymcount;
1448 Elf_Internal_Shdr *symtab_hdr;
1449 asection *srela;
a85d7ed0 1450
0451c93c 1451 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
a85d7ed0
NC		 1452 continue;
1453
0451c93c 1454 for (s = ibfd->sections; s != NULL; s = s->next)
a85d7ed0 1455 {
ec338859 1456 struct elf_s390_dyn_relocs *p;
0451c93c 1457
ec338859
AM		 1458 for (p = *((struct elf_s390_dyn_relocs **)
1459 &elf_section_data (s)->local_dynrel);
1460 p != NULL;
1461 p = p->next)
a85d7ed0 1462 {
ec338859
AM		 1463 if (!bfd_is_abs_section (p->sec)
1464 && bfd_is_abs_section (p->sec->output_section))
1465 {
1466 /* Input section has been discarded, either because
1467 it is a copy of a linkonce section or due to
1468 linker script /DISCARD/, so we'll be discarding
1469 the relocs too. */
1470 }
248866a8 1471 else if (p->count != 0)
ec338859
AM		 1472 {
1473 srela = elf_section_data (p->sec)->sreloc;
1474 srela->_raw_size += p->count * sizeof (Elf32_External_Rela);
248866a8
AM		 1475 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1476 info->flags |= DF_TEXTREL;
ec338859 1477 }
a85d7ed0
NC		 1478 }
1479 }
0451c93c
MS		 1480
1481 local_got = elf_local_got_refcounts (ibfd);
1482 if (!local_got)
1483 continue;
1484
1485 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1486 locsymcount = symtab_hdr->sh_info;
1487 end_local_got = local_got + locsymcount;
1488 s = htab->sgot;
1489 srela = htab->srelgot;
1490 for (; local_got < end_local_got; ++local_got)
a85d7ed0 1491 {
0451c93c 1492 if (*local_got > 0)
a85d7ed0 1493 {
0451c93c
MS		 1494 *local_got = s->_raw_size;
1495 s->_raw_size += GOT_ENTRY_SIZE;
1496 if (info->shared)
1497 srela->_raw_size += sizeof (Elf32_External_Rela);
a85d7ed0
NC		 1498 }
1499 else
0451c93c
MS		 1500 *local_got = (bfd_vma) -1;
1501 }
1502 }
1503
1504 /* Allocate global sym .plt and .got entries, and space for global
1505 sym dynamic relocs. */
1506 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1507
1508 /* We now have determined the sizes of the various dynamic sections.
1509 Allocate memory for them. */
1510 relocs = false;
1511 for (s = dynobj->sections; s != NULL; s = s->next)
1512 {
1513 if ((s->flags & SEC_LINKER_CREATED) == 0)
1514 continue;
1515
1516 if (s == htab->splt
1517 || s == htab->sgot
1518 || s == htab->sgotplt)
1519 {
1520 /* Strip this section if we don't need it; see the
1521 comment below. */
a85d7ed0 1522 }
0451c93c
MS		 1523 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
1524 {
1525 if (s->_raw_size != 0 && s != htab->srelplt)
1526 relocs = true;
ec338859 1527
0451c93c
MS		 1528 /* We use the reloc_count field as a counter if we need
1529 to copy relocs into the output file. */
1530 s->reloc_count = 0;
1531 }
1532 else
a85d7ed0
NC		 1533 {
1534 /* It's not one of our sections, so don't allocate space. */
1535 continue;
1536 }
1537
0451c93c 1538 if (s->_raw_size == 0)
a85d7ed0 1539 {
0451c93c
MS		 1540 /* If we don't need this section, strip it from the
1541 output file. This is to handle .rela.bss and
1542 .rela.plt. We must create it in
1543 create_dynamic_sections, because it must be created
1544 before the linker maps input sections to output
1545 sections. The linker does that before
1546 adjust_dynamic_symbol is called, and it is that
1547 function which decides whether anything needs to go
1548 into these sections. */
1549
a85d7ed0
NC		 1550 _bfd_strip_section_from_output (info, s);
1551 continue;
1552 }
1553
0451c93c
MS		 1554 /* Allocate memory for the section contents. We use bfd_zalloc
1555 here in case unused entries are not reclaimed before the
1556 section's contents are written out. This should not happen,
1557 but this way if it does, we get a R_390_NONE reloc instead
1558 of garbage. */
1559 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1560 if (s->contents == NULL)
a85d7ed0
NC		 1561 return false;
1562 }
ec338859 1563
0451c93c 1564 if (htab->elf.dynamic_sections_created)
a85d7ed0
NC		 1565 {
1566 /* Add some entries to the .dynamic section. We fill in the
1567 values later, in elf_s390_finish_dynamic_sections, but we
1568 must add the entries now so that we get the correct size for
1569 the .dynamic section. The DT_DEBUG entry is filled in by the
1570 dynamic linker and used by the debugger. */
dc810e39
AM		 1571#define add_dynamic_entry(TAG, VAL) \
1572 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
ec338859 1573
a85d7ed0
NC		 1574 if (! info->shared)
1575 {
dc810e39 1576 if (!add_dynamic_entry (DT_DEBUG, 0))
a85d7ed0
NC		 1577 return false;
1578 }
ec338859 1579
0451c93c 1580 if (htab->splt->_raw_size != 0)
a85d7ed0 1581 {
dc810e39
AM		 1582 if (!add_dynamic_entry (DT_PLTGOT, 0)
1583 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1584 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1585 || !add_dynamic_entry (DT_JMPREL, 0))
a85d7ed0
NC		 1586 return false;
1587 }
ec338859 1588
a85d7ed0
NC		 1589 if (relocs)
1590 {
dc810e39
AM		 1591 if (!add_dynamic_entry (DT_RELA, 0)
1592 || !add_dynamic_entry (DT_RELASZ, 0)
1593 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
a85d7ed0 1594 return false;
a85d7ed0 1595
0451c93c
MS		 1596 /* If any dynamic relocs apply to a read-only section,
1597 then we need a DT_TEXTREL entry. */
248866a8
AM		 1598 if ((info->flags & DF_TEXTREL) == 0)
1599 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1600 (PTR) info);
ec338859 1601
0451c93c
MS		 1602 if ((info->flags & DF_TEXTREL) != 0)
1603 {
1604 if (!add_dynamic_entry (DT_TEXTREL, 0))
1605 return false;
1606 }
a85d7ed0
NC		 1607 }
1608 }
dc810e39 1609#undef add_dynamic_entry
ec338859 1610
a85d7ed0
NC		 1611 return true;
1612}
1613
a85d7ed0
NC		 1614/* Relocate a 390 ELF section. */
1615
1616static boolean
1617elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1618 contents, relocs, local_syms, local_sections)
1619 bfd *output_bfd;
1620 struct bfd_link_info *info;
1621 bfd *input_bfd;
1622 asection *input_section;
1623 bfd_byte *contents;
1624 Elf_Internal_Rela *relocs;
1625 Elf_Internal_Sym *local_syms;
1626 asection **local_sections;
1627{
0451c93c 1628 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 1629 Elf_Internal_Shdr *symtab_hdr;
1630 struct elf_link_hash_entry **sym_hashes;
1631 bfd_vma *local_got_offsets;
a85d7ed0
NC		 1632 Elf_Internal_Rela *rel;
1633 Elf_Internal_Rela *relend;
1634
b491616a
AM		 1635 if (info->relocateable)
1636 return true;
1637
0451c93c 1638 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 1639 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1640 sym_hashes = elf_sym_hashes (input_bfd);
1641 local_got_offsets = elf_local_got_offsets (input_bfd);
1642
a85d7ed0
NC		 1643 rel = relocs;
1644 relend = relocs + input_section->reloc_count;
1645 for (; rel < relend; rel++)
1646 {
1647 int r_type;
1648 reloc_howto_type *howto;
1649 unsigned long r_symndx;
1650 struct elf_link_hash_entry *h;
1651 Elf_Internal_Sym *sym;
1652 asection *sec;
0451c93c 1653 bfd_vma off;
a85d7ed0 1654 bfd_vma relocation;
0451c93c 1655 boolean unresolved_reloc;
a85d7ed0 1656 bfd_reloc_status_type r;
ec338859 1657
a85d7ed0
NC		 1658 r_type = ELF32_R_TYPE (rel->r_info);
1659 if (r_type == (int) R_390_GNU_VTINHERIT
1660 || r_type == (int) R_390_GNU_VTENTRY)
1661 continue;
1662 if (r_type < 0 || r_type >= (int) R_390_max)
1663 {
1664 bfd_set_error (bfd_error_bad_value);
1665 return false;
1666 }
ec338859 1667
b491616a 1668 howto = elf_howto_table + r_type;
a85d7ed0 1669 r_symndx = ELF32_R_SYM (rel->r_info);
a85d7ed0
NC		 1670 h = NULL;
1671 sym = NULL;
1672 sec = NULL;
0451c93c 1673 unresolved_reloc = false;
a85d7ed0
NC		 1674 if (r_symndx < symtab_hdr->sh_info)
1675 {
1676 sym = local_syms + r_symndx;
1677 sec = local_sections[r_symndx];
f8df10f4 1678 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
a85d7ed0
NC		 1679 }
1680 else
1681 {
1682 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1683 while (h->root.type == bfd_link_hash_indirect
1684 || h->root.type == bfd_link_hash_warning)
1685 h = (struct elf_link_hash_entry *) h->root.u.i.link;
ec338859 1686
a85d7ed0
NC		 1687 if (h->root.type == bfd_link_hash_defined
1688 || h->root.type == bfd_link_hash_defweak)
1689 {
1690 sec = h->root.u.def.section;
27018c3f 1691 if (sec->output_section == NULL)
a85d7ed0 1692 {
0451c93c
MS		 1693 /* Set a flag that will be cleared later if we find a
1694 relocation value for this symbol. output_section
1695 is typically NULL for symbols satisfied by a shared
1696 library. */
1697 unresolved_reloc = true;
a85d7ed0
NC		 1698 relocation = 0;
1699 }
1700 else
1701 relocation = (h->root.u.def.value
1702 + sec->output_section->vma
1703 + sec->output_offset);
1704 }
1705 else if (h->root.type == bfd_link_hash_undefweak)
1706 relocation = 0;
671bae9c
NC		 1707 else if (info->shared
1708 && (!info->symbolic || info->allow_shlib_undefined)
a85d7ed0
NC		 1709 && !info->no_undefined
1710 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1711 relocation = 0;
1712 else
1713 {
1714 if (! ((*info->callbacks->undefined_symbol)
1715 (info, h->root.root.string, input_bfd,
1716 input_section, rel->r_offset,
0451c93c
MS		 1717 (!info->shared || info->no_undefined
1718 || ELF_ST_VISIBILITY (h->other)))))
a85d7ed0
NC		 1719 return false;
1720 relocation = 0;
1721 }
1722 }
ec338859 1723
a85d7ed0
NC		 1724 switch (r_type)
1725 {
1726 case R_390_GOT12:
1727 case R_390_GOT16:
1728 case R_390_GOT32:
befc3abb 1729 case R_390_GOTENT:
a85d7ed0
NC		 1730 /* Relocation is to the entry for this symbol in the global
1731 offset table. */
0451c93c
MS		 1732 if (htab->sgot == NULL)
1733 abort ();
ec338859 1734
a85d7ed0
NC		 1735 if (h != NULL)
1736 {
0451c93c 1737 boolean dyn;
ec338859 1738
a85d7ed0 1739 off = h->got.offset;
0451c93c
MS		 1740 dyn = htab->elf.dynamic_sections_created;
1741 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
a85d7ed0 1742 || (info->shared
0451c93c
MS		 1743 && (info->symbolic
1744 || h->dynindx == -1
1745 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
a85d7ed0
NC		 1746 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1747 {
1748 /* This is actually a static link, or it is a
1749 -Bsymbolic link and the symbol is defined
1750 locally, or the symbol was forced to be local
1751 because of a version file. We must initialize
1752 this entry in the global offset table. Since the
1753 offset must always be a multiple of 2, we use the
1754 least significant bit to record whether we have
1755 initialized it already.
1756
1757 When doing a dynamic link, we create a .rel.got
1758 relocation entry to initialize the value. This
1759 is done in the finish_dynamic_symbol routine. */
1760 if ((off & 1) != 0)
1761 off &= ~1;
1762 else
1763 {
1764 bfd_put_32 (output_bfd, relocation,
0451c93c 1765 htab->sgot->contents + off);
a85d7ed0
NC		 1766 h->got.offset |= 1;
1767 }
1768 }
0451c93c
MS		 1769 else
1770 unresolved_reloc = false;
a85d7ed0
NC		 1771 }
1772 else
1773 {
0451c93c
MS		 1774 if (local_got_offsets == NULL)
1775 abort ();
a85d7ed0
NC		 1776
1777 off = local_got_offsets[r_symndx];
1778
1779 /* The offset must always be a multiple of 4. We use
1780 the least significant bit to record whether we have
1781 already generated the necessary reloc. */
1782 if ((off & 1) != 0)
1783 off &= ~1;
1784 else
1785 {
0451c93c
MS		 1786 bfd_put_32 (output_bfd, relocation,
1787 htab->sgot->contents + off);
a85d7ed0
NC		 1788
1789 if (info->shared)
1790 {
1791 asection *srelgot;
1792 Elf_Internal_Rela outrel;
0451c93c 1793 Elf32_External_Rela *loc;
a85d7ed0 1794
0451c93c
MS		 1795 srelgot = htab->srelgot;
1796 if (srelgot == NULL)
1797 abort ();
a85d7ed0 1798
0451c93c
MS		 1799 outrel.r_offset = (htab->sgot->output_section->vma
1800 + htab->sgot->output_offset
a85d7ed0
NC		 1801 + off);
1802 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1803 outrel.r_addend = relocation;
0451c93c
MS		 1804 loc = (Elf32_External_Rela *) srelgot->contents;
1805 loc += srelgot->reloc_count++;
1806 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
a85d7ed0
NC		 1807 }
1808
1809 local_got_offsets[r_symndx] |= 1;
1810 }
a85d7ed0
NC		 1811 }
1812
0451c93c
MS		 1813 if (off >= (bfd_vma) -2)
1814 abort ();
a85d7ed0 1815
0451c93c 1816 relocation = htab->sgot->output_offset + off;
befc3abb
MS		 1817
1818 /*
1819 * For @GOTENT the relocation is against the offset between
1820 * the instruction and the symbols entry in the GOT and not
1821 * between the start of the GOT and the symbols entry. We
1822 * add the vma of the GOT to get the correct value.
1823 */
1824 if (r_type == R_390_GOTENT)
1825 relocation += htab->sgot->output_section->vma;
1826
a85d7ed0 1827 break;
dc810e39 1828
a85d7ed0
NC		 1829 case R_390_GOTOFF:
1830 /* Relocation is relative to the start of the global offset
1831 table. */
1832
a85d7ed0
NC		 1833 /* Note that sgot->output_offset is not involved in this
1834 calculation. We always want the start of .got. If we
1835 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1836 permitted by the ABI, we might have to change this
1837 calculation. */
0451c93c 1838 relocation -= htab->sgot->output_section->vma;
a85d7ed0
NC		 1839 break;
1840
1841 case R_390_GOTPC:
befc3abb 1842 case R_390_GOTPCDBL:
a85d7ed0 1843 /* Use global offset table as symbol value. */
0451c93c
MS		 1844 relocation = htab->sgot->output_section->vma;
1845 unresolved_reloc = false;
a85d7ed0
NC		 1846 break;
1847
1848 case R_390_PLT16DBL:
befc3abb 1849 case R_390_PLT32DBL:
a85d7ed0
NC		 1850 case R_390_PLT32:
1851 /* Relocation is to the entry for this symbol in the
1852 procedure linkage table. */
1853
1854 /* Resolve a PLT32 reloc against a local symbol directly,
1855 without using the procedure linkage table. */
1856 if (h == NULL)
1857 break;
1858
0451c93c
MS		 1859 if (h->plt.offset == (bfd_vma) -1
1860 || htab->splt == NULL)
a85d7ed0
NC		 1861 {
1862 /* We didn't make a PLT entry for this symbol. This
1863 happens when statically linking PIC code, or when
1864 using -Bsymbolic. */
1865 break;
1866 }
1867
0451c93c
MS		 1868 relocation = (htab->splt->output_section->vma
1869 + htab->splt->output_offset
a85d7ed0 1870 + h->plt.offset);
0451c93c 1871 unresolved_reloc = false;
a85d7ed0
NC		 1872 break;
1873
1874 case R_390_8:
1875 case R_390_16:
1876 case R_390_32:
1877 case R_390_PC16:
1878 case R_390_PC16DBL:
befc3abb 1879 case R_390_PC32DBL:
a85d7ed0 1880 case R_390_PC32:
ec338859
AM		 1881 /* r_symndx will be zero only for relocs against symbols
1882 from removed linkonce sections, or sections discarded by
1883 a linker script. */
1884 if (r_symndx == 0
1885 || (input_section->flags & SEC_ALLOC) == 0)
1886 break;
1887
0451c93c 1888 if ((info->shared
0451c93c
MS		 1889 && ((r_type != R_390_PC16
1890 && r_type != R_390_PC16DBL
befc3abb 1891 && r_type != R_390_PC32DBL
0451c93c
MS		 1892 && r_type != R_390_PC32)
1893 || (h != NULL
1894 && h->dynindx != -1
1895 && (! info->symbolic
1896 || (h->elf_link_hash_flags
1897 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1898 || (!info->shared
0451c93c
MS		 1899 && h != NULL
1900 && h->dynindx != -1
1901 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1902 && (((h->elf_link_hash_flags
1903 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1904 && (h->elf_link_hash_flags
1905 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1906 || h->root.type == bfd_link_hash_undefweak
1907 || h->root.type == bfd_link_hash_undefined)))
a85d7ed0
NC		 1908 {
1909 Elf_Internal_Rela outrel;
1910 boolean skip, relocate;
0451c93c
MS		 1911 asection *sreloc;
1912 Elf32_External_Rela *loc;
ec338859 1913
0451c93c
MS		 1914 /* When generating a shared object, these relocations
1915 are copied into the output file to be resolved at run
1916 time. */
ec338859 1917
a85d7ed0 1918 skip = false;
0bb2d96a 1919 relocate = false;
ec338859 1920
c629eae0
JJ		 1921 outrel.r_offset =
1922 _bfd_elf_section_offset (output_bfd, info, input_section,
1923 rel->r_offset);
1924 if (outrel.r_offset == (bfd_vma) -1)
1925 skip = true;
0bb2d96a
JJ		 1926 else if (outrel.r_offset == (bfd_vma) -2)
1927 skip = true, relocate = true;
a85d7ed0
NC		 1928 outrel.r_offset += (input_section->output_section->vma
1929 + input_section->output_offset);
ec338859 1930
a85d7ed0 1931 if (skip)
0bb2d96a 1932 memset (&outrel, 0, sizeof outrel);
0451c93c
MS		 1933 else if (h != NULL
1934 && h->dynindx != -1
1935 && (r_type == R_390_PC16
1936 || r_type == R_390_PC16DBL
befc3abb 1937 || r_type == R_390_PC32DBL
0451c93c
MS		 1938 || r_type == R_390_PC32
1939 || !info->shared
1940 || !info->symbolic
1941 || (h->elf_link_hash_flags
1942 & ELF_LINK_HASH_DEF_REGULAR) == 0))
a85d7ed0 1943 {
a85d7ed0 1944 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
27018c3f 1945 outrel.r_addend = rel->r_addend;
a85d7ed0
NC		 1946 }
1947 else
1948 {
0451c93c
MS		 1949 /* This symbol is local, or marked to become local. */
1950 relocate = true;
1951 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1952 outrel.r_addend = relocation + rel->r_addend;
a85d7ed0 1953 }
ec338859 1954
0451c93c
MS		 1955 sreloc = elf_section_data (input_section)->sreloc;
1956 if (sreloc == NULL)
1957 abort ();
ec338859 1958
0451c93c
MS		 1959 loc = (Elf32_External_Rela *) sreloc->contents;
1960 loc += sreloc->reloc_count++;
1961 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
ec338859 1962
a85d7ed0
NC		 1963 /* If this reloc is against an external symbol, we do
1964 not want to fiddle with the addend. Otherwise, we
1965 need to include the symbol value so that it becomes
1966 an addend for the dynamic reloc. */
1967 if (! relocate)
1968 continue;
1969 }
0451c93c 1970 break;
ec338859 1971
0451c93c
MS		 1972 default:
1973 break;
1974 }
ec338859 1975
0451c93c
MS		 1976 if (unresolved_reloc
1977 && !(info->shared
1978 && (input_section->flags & SEC_DEBUGGING) != 0
1979 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1980 (*_bfd_error_handler)
1981 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1982 bfd_archive_filename (input_bfd),
1983 bfd_get_section_name (input_bfd, input_section),
1984 (long) rel->r_offset,
1985 h->root.root.string);
ec338859 1986
a85d7ed0 1987 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
0451c93c
MS		 1988 contents, rel->r_offset,
1989 relocation, rel->r_addend);
ec338859 1990
a85d7ed0
NC		 1991 if (r != bfd_reloc_ok)
1992 {
0451c93c 1993 const char *name;
ec338859 1994
0451c93c
MS		 1995 if (h != NULL)
1996 name = h->root.root.string;
1997 else
a85d7ed0 1998 {
0451c93c
MS		 1999 name = bfd_elf_string_from_elf_section (input_bfd,
2000 symtab_hdr->sh_link,
2001 sym->st_name);
2002 if (name == NULL)
2003 return false;
2004 if (*name == '\0')
2005 name = bfd_section_name (input_bfd, sec);
2006 }
ec338859 2007
0451c93c
MS		 2008 if (r == bfd_reloc_overflow)
2009 {
ec338859 2010
0451c93c
MS		 2011 if (! ((*info->callbacks->reloc_overflow)
2012 (info, name, howto->name, (bfd_vma) 0,
2013 input_bfd, input_section, rel->r_offset)))
2014 return false;
2015 }
2016 else
2017 {
2018 (*_bfd_error_handler)
2019 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2020 bfd_archive_filename (input_bfd),
2021 bfd_get_section_name (input_bfd, input_section),
2022 (long) rel->r_offset, name, (int) r);
2023 return false;
a85d7ed0
NC		 2024 }
2025 }
2026 }
ec338859 2027
a85d7ed0
NC		 2028 return true;
2029}
2030
2031/* Finish up dynamic symbol handling. We set the contents of various
2032 dynamic sections here. */
2033
2034static boolean
2035elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
2036 bfd *output_bfd;
2037 struct bfd_link_info *info;
2038 struct elf_link_hash_entry *h;
2039 Elf_Internal_Sym *sym;
2040{
0451c93c 2041 struct elf_s390_link_hash_table *htab;
ec338859 2042
0451c93c 2043 htab = elf_s390_hash_table (info);
ec338859 2044
a85d7ed0
NC		 2045 if (h->plt.offset != (bfd_vma) -1)
2046 {
0451c93c
MS		 2047 bfd_vma plt_index;
2048 bfd_vma got_offset;
a85d7ed0 2049 Elf_Internal_Rela rela;
0451c93c 2050 Elf32_External_Rela *loc;
a85d7ed0 2051 bfd_vma relative_offset;
ec338859 2052
a85d7ed0
NC		 2053 /* This symbol has an entry in the procedure linkage table. Set
2054 it up. */
ec338859 2055
0451c93c
MS		 2056 if (h->dynindx == -1
2057 || htab->splt == NULL
2058 || htab->sgotplt == NULL
2059 || htab->srelplt == NULL)
2060 abort ();
a85d7ed0 2061
dc810e39 2062 /* Calc. index no.
a85d7ed0
NC		 2063 Current offset - size first entry / entry size. */
2064 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
2065
2066 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2067 addr & GOT addr. */
2068 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
2069
2070 /* S390 uses halfwords for relative branch calc! */
dc810e39
AM		 2071 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
2072 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
a85d7ed0
NC		 2073 /* If offset is > 32768, branch to a previous branch
2074 390 can only handle +-64 K jumps. */
dc810e39
AM		 2075 if ( -32768 > (int) relative_offset )
2076 relative_offset =
2077 -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
a85d7ed0
NC		 2078
2079 /* Fill in the entry in the procedure linkage table. */
2080 if (!info->shared)
0451c93c
MS		 2081 {
2082 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
2083 htab->splt->contents + h->plt.offset);
2084 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
2085 htab->splt->contents + h->plt.offset + 4);
2086 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
2087 htab->splt->contents + h->plt.offset + 8);
2088 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
2089 htab->splt->contents + h->plt.offset + 12);
2090 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
2091 htab->splt->contents + h->plt.offset + 16);
2092 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2093 htab->splt->contents + h->plt.offset + 20);
2094 bfd_put_32 (output_bfd,
2095 (htab->sgotplt->output_section->vma
2096 + htab->sgotplt->output_offset
2097 + got_offset),
2098 htab->splt->contents + h->plt.offset + 24);
2099 }
a85d7ed0 2100 else if (got_offset < 4096)
0451c93c
MS		 2101 {
2102 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
2103 htab->splt->contents + h->plt.offset);
2104 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
2105 htab->splt->contents + h->plt.offset + 4);
2106 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
2107 htab->splt->contents + h->plt.offset + 8);
2108 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
2109 htab->splt->contents + h->plt.offset + 12);
2110 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
2111 htab->splt->contents + h->plt.offset + 16);
2112 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2113 htab->splt->contents + h->plt.offset + 20);
2114 bfd_put_32 (output_bfd, (bfd_vma) 0,
2115 htab->splt->contents + h->plt.offset + 24);
2116 }
a85d7ed0 2117 else if (got_offset < 32768)
0451c93c
MS		 2118 {
2119 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
2120 htab->splt->contents + h->plt.offset);
2121 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
2122 htab->splt->contents + h->plt.offset + 4);
2123 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
2124 htab->splt->contents + h->plt.offset + 8);
2125 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
2126 htab->splt->contents + h->plt.offset + 12);
2127 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
2128 htab->splt->contents + h->plt.offset + 16);
2129 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2130 htab->splt->contents + h->plt.offset + 20);
2131 bfd_put_32 (output_bfd, (bfd_vma) 0,
2132 htab->splt->contents + h->plt.offset + 24);
2133 }
a85d7ed0 2134 else
0451c93c
MS		 2135 {
2136 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
2137 htab->splt->contents + h->plt.offset);
2138 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
2139 htab->splt->contents + h->plt.offset + 4);
2140 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
2141 htab->splt->contents + h->plt.offset + 8);
2142 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
2143 htab->splt->contents + h->plt.offset + 12);
2144 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
2145 htab->splt->contents + h->plt.offset + 16);
2146 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2147 htab->splt->contents + h->plt.offset + 20);
2148 bfd_put_32 (output_bfd, got_offset,
2149 htab->splt->contents + h->plt.offset + 24);
2150 }
a85d7ed0
NC		 2151 /* Insert offset into reloc. table here. */
2152 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
0451c93c 2153 htab->splt->contents + h->plt.offset + 28);
a85d7ed0
NC		 2154
2155 /* Fill in the entry in the global offset table.
2156 Points to instruction after GOT offset. */
2157 bfd_put_32 (output_bfd,
0451c93c
MS		 2158 (htab->splt->output_section->vma
2159 + htab->splt->output_offset
a85d7ed0
NC		 2160 + h->plt.offset
2161 + 12),
0451c93c 2162 htab->sgotplt->contents + got_offset);
a85d7ed0 2163
0451c93c
MS		 2164 /* Fill in the entry in the .rela.plt section. */
2165 rela.r_offset = (htab->sgotplt->output_section->vma
2166 + htab->sgotplt->output_offset
2167 + got_offset);
2168 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
2169 rela.r_addend = 0;
2170 loc = (Elf32_External_Rela *) htab->srelplt->contents + plt_index;
2171 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
ec338859 2172
a85d7ed0
NC		 2173 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2174 {
2175 /* Mark the symbol as undefined, rather than as defined in
0451c93c
MS		 2176 the .plt section. Leave the value alone. This is a clue
2177 for the dynamic linker, to make function pointer
2178 comparisons work between an application and shared
ec338859 2179 library. */
a85d7ed0
NC		 2180 sym->st_shndx = SHN_UNDEF;
2181 }
2182 }
ec338859 2183
a85d7ed0
NC		 2184 if (h->got.offset != (bfd_vma) -1)
2185 {
a85d7ed0 2186 Elf_Internal_Rela rela;
0451c93c 2187 Elf32_External_Rela *loc;
a85d7ed0
NC		 2188
2189 /* This symbol has an entry in the global offset table. Set it
2190 up. */
2191
0451c93c
MS		 2192 if (htab->sgot == NULL || htab->srelgot == NULL)
2193 abort ();
a85d7ed0 2194
0451c93c
MS		 2195 rela.r_offset = (htab->sgot->output_section->vma
2196 + htab->sgot->output_offset
dc810e39 2197 + (h->got.offset &~ (bfd_vma) 1));
a85d7ed0
NC		 2198
2199 /* If this is a static link, or it is a -Bsymbolic link and the
2200 symbol is defined locally or was forced to be local because
2201 of a version file, we just want to emit a RELATIVE reloc.
2202 The entry in the global offset table will already have been
2203 initialized in the relocate_section function. */
0451c93c
MS		 2204 if (info->shared
2205 && (info->symbolic
2206 || h->dynindx == -1
2207 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2208 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2209 {
2210 BFD_ASSERT((h->got.offset & 1) != 0);
2211 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2212 rela.r_addend = (h->root.u.def.value
a85d7ed0
NC		 2213 + h->root.u.def.section->output_section->vma
2214 + h->root.u.def.section->output_offset);
2215 }
2216 else
2217 {
2218 BFD_ASSERT((h->got.offset & 1) == 0);
0451c93c 2219 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
a85d7ed0
NC		 2220 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
2221 rela.r_addend = 0;
2222 }
2223
0451c93c
MS		 2224 loc = (Elf32_External_Rela *) htab->srelgot->contents;
2225 loc += htab->srelgot->reloc_count++;
2226 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2227 }
2228
2229 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2230 {
a85d7ed0 2231 Elf_Internal_Rela rela;
0451c93c 2232 Elf32_External_Rela *loc;
a85d7ed0
NC		 2233
2234 /* This symbols needs a copy reloc. Set it up. */
2235
0451c93c
MS		 2236 if (h->dynindx == -1
2237 || (h->root.type != bfd_link_hash_defined
2238 && h->root.type != bfd_link_hash_defweak)
2239 || htab->srelbss == NULL)
2240 abort ();
a85d7ed0
NC		 2241
2242 rela.r_offset = (h->root.u.def.value
2243 + h->root.u.def.section->output_section->vma
2244 + h->root.u.def.section->output_offset);
2245 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
2246 rela.r_addend = 0;
0451c93c
MS		 2247 loc = (Elf32_External_Rela *) htab->srelbss->contents;
2248 loc += htab->srelbss->reloc_count++;
2249 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2250 }
2251
2252 /* Mark some specially defined symbols as absolute. */
2253 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2254 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2255 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2256 sym->st_shndx = SHN_ABS;
2257
2258 return true;
2259}
2260
0451c93c
MS		 2261/* Used to decide how to sort relocs in an optimal manner for the
2262 dynamic linker, before writing them out. */
2263
2264static enum elf_reloc_type_class
2265elf_s390_reloc_type_class (rela)
2266 const Elf_Internal_Rela *rela;
2267{
2268 switch ((int) ELF32_R_TYPE (rela->r_info))
2269 {
2270 case R_390_RELATIVE:
2271 return reloc_class_relative;
2272 case R_390_JMP_SLOT:
2273 return reloc_class_plt;
2274 case R_390_COPY:
2275 return reloc_class_copy;
2276 default:
2277 return reloc_class_normal;
2278 }
2279}
2280
a85d7ed0
NC		 2281/* Finish up the dynamic sections. */
2282
2283static boolean
2284elf_s390_finish_dynamic_sections (output_bfd, info)
2285 bfd *output_bfd;
2286 struct bfd_link_info *info;
2287{
0451c93c 2288 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 2289 bfd *dynobj;
2290 asection *sdyn;
a85d7ed0 2291
0451c93c
MS		 2292 htab = elf_s390_hash_table (info);
2293 dynobj = htab->elf.dynobj;
a85d7ed0
NC		 2294 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2295
0451c93c 2296 if (htab->elf.dynamic_sections_created)
a85d7ed0 2297 {
a85d7ed0
NC		 2298 Elf32_External_Dyn *dyncon, *dynconend;
2299
0451c93c
MS		 2300 if (sdyn == NULL || htab->sgot == NULL)
2301 abort ();
a85d7ed0
NC		 2302
2303 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2304 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2305 for (; dyncon < dynconend; dyncon++)
2306 {
2307 Elf_Internal_Dyn dyn;
a85d7ed0 2308 asection *s;
ec338859 2309
a85d7ed0 2310 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
ec338859 2311
a85d7ed0
NC		 2312 switch (dyn.d_tag)
2313 {
2314 default:
0451c93c 2315 continue;
ec338859 2316
a85d7ed0 2317 case DT_PLTGOT:
0451c93c
MS		 2318 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2319 break;
ec338859 2320
a85d7ed0 2321 case DT_JMPREL:
0451c93c 2322 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
a85d7ed0
NC		 2323 break;
2324
2325 case DT_PLTRELSZ:
0451c93c 2326 s = htab->srelplt->output_section;
a85d7ed0
NC		 2327 if (s->_cooked_size != 0)
2328 dyn.d_un.d_val = s->_cooked_size;
2329 else
2330 dyn.d_un.d_val = s->_raw_size;
a85d7ed0
NC		 2331 break;
2332 }
0451c93c
MS		 2333
2334 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
a85d7ed0
NC		 2335 }
2336
2337 /* Fill in the special first entry in the procedure linkage table. */
0451c93c 2338 if (htab->splt && htab->splt->_raw_size > 0)
a85d7ed0 2339 {
0451c93c 2340 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
a85d7ed0 2341 if (info->shared)
0451c93c 2342 {
dc810e39 2343 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
0451c93c 2344 htab->splt->contents );
dc810e39 2345 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
0451c93c 2346 htab->splt->contents +4 );
dc810e39 2347 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
0451c93c 2348 htab->splt->contents +8 );
dc810e39 2349 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
0451c93c 2350 htab->splt->contents +12 );
dc810e39 2351 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
0451c93c 2352 htab->splt->contents +16 );
a85d7ed0
NC		 2353 }
2354 else
2355 {
0451c93c
MS		 2356 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
2357 htab->splt->contents );
dc810e39 2358 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
0451c93c 2359 htab->splt->contents +4 );
dc810e39 2360 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
0451c93c 2361 htab->splt->contents +8 );
dc810e39 2362 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
0451c93c 2363 htab->splt->contents +12 );
dc810e39 2364 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
0451c93c 2365 htab->splt->contents +16 );
dc810e39 2366 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
0451c93c 2367 htab->splt->contents +20 );
a85d7ed0 2368 bfd_put_32 (output_bfd,
0451c93c
MS		 2369 htab->sgotplt->output_section->vma
2370 + htab->sgotplt->output_offset,
2371 htab->splt->contents + 24);
a85d7ed0 2372 }
0451c93c
MS		 2373 elf_section_data (htab->splt->output_section)
2374 ->this_hdr.sh_entsize = 4;
a85d7ed0
NC		 2375 }
2376
2377 }
2378
0451c93c 2379 if (htab->sgotplt)
a85d7ed0 2380 {
0451c93c
MS		 2381 /* Fill in the first three entries in the global offset table. */
2382 if (htab->sgotplt->_raw_size > 0)
2383 {
2384 bfd_put_32 (output_bfd,
2385 (sdyn == NULL ? (bfd_vma) 0
2386 : sdyn->output_section->vma + sdyn->output_offset),
2387 htab->sgotplt->contents);
2388 /* One entry for shared object struct ptr. */
2389 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
2390 /* One entry for _dl_runtime_resolve. */
2391 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
2392 }
a85d7ed0 2393
0451c93c
MS		 2394 elf_section_data (htab->sgotplt->output_section)
2395 ->this_hdr.sh_entsize = 4;
2396 }
a85d7ed0
NC		 2397 return true;
2398}
2399
2400static boolean
2401elf_s390_object_p (abfd)
2402 bfd *abfd;
2403{
befc3abb 2404 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
a85d7ed0
NC		 2405}
2406
979f4a38
NC		 2407static boolean
2408elf_s390_grok_prstatus (abfd, note)
2409 bfd * abfd;
2410 Elf_Internal_Note * note;
2411{
2412 int offset;
2413 unsigned int raw_size;
2414
2415 switch (note->descsz)
2416 {
2417 default:
2418 return false;
2419
2420 case 224: /* S/390 Linux. */
2421 /* pr_cursig */
2422 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2423
2424 /* pr_pid */
2425 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
2426
2427 /* pr_reg */
2428 offset = 72;
2429 raw_size = 144;
2430 break;
2431 }
2432
2433 /* Make a ".reg/999" section. */
2434 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
2435 raw_size, note->descpos + offset);
2436}
2437
a85d7ed0
NC		 2438#define TARGET_BIG_SYM bfd_elf32_s390_vec
2439#define TARGET_BIG_NAME "elf32-s390"
2440#define ELF_ARCH bfd_arch_s390
2441#define ELF_MACHINE_CODE EM_S390
2442#define ELF_MACHINE_ALT1 EM_S390_OLD
2443#define ELF_MAXPAGESIZE 0x1000
2444
2445#define elf_backend_can_gc_sections 1
51b64d56 2446#define elf_backend_can_refcount 1
a85d7ed0
NC		 2447#define elf_backend_want_got_plt 1
2448#define elf_backend_plt_readonly 1
2449#define elf_backend_want_plt_sym 0
2450#define elf_backend_got_header_size 12
2451#define elf_backend_plt_header_size PLT_ENTRY_SIZE
b491616a 2452#define elf_backend_rela_normal 1
a85d7ed0
NC		 2453
2454#define elf_info_to_howto elf_s390_info_to_howto
2455
a85d7ed0
NC		 2456#define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
2457#define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
2458#define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2459
2460#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2461#define elf_backend_check_relocs elf_s390_check_relocs
0451c93c
MS		 2462#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
2463#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
a85d7ed0
NC		 2464#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2465#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2466#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2467#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
0451c93c 2468#define elf_backend_reloc_type_class elf_s390_reloc_type_class
a85d7ed0
NC		 2469#define elf_backend_relocate_section elf_s390_relocate_section
2470#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
29c2fb7c 2471#define elf_backend_reloc_type_class elf_s390_reloc_type_class
979f4a38 2472#define elf_backend_grok_prstatus elf_s390_grok_prstatus
a85d7ed0
NC		 2473
2474#define elf_backend_object_p elf_s390_object_p
2475
2476#include "elf32-target.h"
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